Can someone tell me if deep red indented stretch marks could be a sign of steroid use? My girlfriend and I have noticed these sudden changes in our teen-age boys. I know for a fact that my son was injecting for awhile but has stopped now. He has these stretch marks that don't look like they are from simple weight gain or loss. They look terrible. My girlfriend's son has them too now. We were talking and noticed a common link with both boys.